Materials Literature
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The mechanical behavior of plain woven fabric composites under inplane loading is investigated using 3-D finite element analysis (FEA) in conjunction with a micro-mechanical model. The analysis incorporates both geometric and material nonlinearities. The use of finite elements facilitates accurate description of the g…
Farblose Einkristalle von La2(SeO3)3 wurden bei der Zersetzung von La2(SeO4)3 in Gegenwart von NaCl in verschweißten Goldampullen erhalten. Die Verbindung kristallisiert orthorhombisch (Pnma, Z = 4, a = 846,7(1), b = 1428,6(1), c = 710,3(2) pm, Rall = 0,0223). In der Kristallstruktur sind die La3+-Ionen zehnfach von S…
Polyaniline films have been prepared both chemically and electrochemically using formic (‘Pani-Formic’), boric (‘Pani-Boric’) or acetic acid (‘Pani-Acetic’) as protonation media. Among the three, formic acid seems to be a better protonating medium because it selectively yields the conducting phase of polyaniline. The…
A thin film of deuterated poly(methyl methacrylate) (A) and poly(styrene-ran-acrylonitrile) at the critical composition is annealed in the two phase region to induce simultaneous phase separation and wetting of the A-rich phase at the surface. Using forward recoil spectrometry, the wetting layer thickness is found to…
Dielectric studies of the first order phase transition of a ferroelectric liquid crystal material having the phase sequence chiral nematic to smectic C* have been performed using thin (2.5 mum) cells in the frequency range 0.01 Hz to 12 MHz. For planar alignment, one of the cell electrodes was covered with a polymer a…
Copolymers sPS-B consisting of blocks of syndiotactic polystyrene (sPS) and polybutadiene (B) have been prepared using CpTiX3 (Cp = C5H5, X = Cl, F; Cp = C5Me5, X = Me) and TiXn (n = 3, X = acetylacetonate (acac); n = 4, X = O-tert-Bu) activated with methylaluminoxane (MAO). If proper conditions are used, copolymers c…
We synthesized solubilized alkoxysilane-modified perylene derivatives which were covalently attached to an inorganic host matrix, prepared via the sol−gel process. It was shown that the covalent attachment of the alkoxysilane-modified perylenes led to more homogeneous sols and higher concentrations of the dyes in the…
Multiphonon relaxation rates were measured for 13 different energy levels of various rare-earth ions in ${\mathrm{YVO}}_{4}$ single crystals at 77 K. Dependence of the multiphonon relaxation rate on the energy gap that separates each emitting multiplet from the one lying just below it was investigated over the range f…
Nonporous hydrogel microspheres 0.1–1.3 μm in diameter were prepared by the dispersion copolymerization of 1-vinyl-2-pyrrolidone and ethylene dimethacrylate as a crosslinking agent. The crosslinking was evidenced by solid state 13C NMR and elemental analysis. The effect of various parameters including selection of sol…
We have measured the solvation dynamics of a dipolar supercooled liquid near its glass transition in a temperature range in which the average structural relaxation time varies more than four orders of magnitude. The analysis of the time dependent average emission energy and the inhomogeneous linewidth of the S0<--T1(0…
Monolayer-protected nanoclusters exhibit good stabilityboth in solution and dry forms and as such are promising materials for nanocircuits and nanodevices. In this article, an efficient method for fabricating 2D crosslinked nanoparticle networks using the Langmuir–Blodgett technique and dithiols as bifunctional linker…
Alternating oligomers and polymers consisting of 2,2′-bipyridine and diethinylenebenzene units and corresponding model compounds were synthesized and investigated in dilute solutions by absorption spectroscopy and by stationary and time-resolved emission spectroscopy. The strictly linear (rod-like) π-chain oligomers/p…
In this paper, Fourier transform infrared (FT-IR) spectroscopy is used to study the thermal properties of methyl silsesquioxane (MSQ), an important low-dielectric-constant organic spin-on glass for semiconductor device fabrication. The compositional and structural changes of MSQ with temperature are investigated in de…
A novel bis(ether anhydride) monomer, 1,4-bis(3,4-dicarboxyphenoxy)-2-tert-butylbenzene dianhydride, was synthesized from the nitro displacement of 4-nitrophthalodinitrile by the phenoxide ion of tert-butylhydroquinone, followed by alkaline hydrolysis of the intermediate bis(ether dinitrile) and dehydration of the res…
Electron paramagnetic resonance (EPR) measurements have been made of amorphous hydrogenated carbon (a-C:H) films grown by plasma enhanced chemical vapor deposition (PECVD) with negative self-bias voltages ${V}_{b}$ in the approximate range 10--540 V. For ${V}_{b}<100\mathrm{V},$ as the film changes from polymerlike…
We have developed a new error correction method (Picket: a combination of a long distance code (LDC) and a burst indicator subcode (BIS)), a new channel modulation scheme (17PP, or (1, 7) RLL parity preserve (PP)-prohibit repeated minimum transition runlength (RMTR) in full), and a new address format (zoned constant a…
A new methodology based on a novel combination of a high-resolution specular x-ray reflectivity and small-angle neutron scattering has been developed to evaluate the structural properties of low-dielectric-constant porous silica thin films about one micrometer thick supported on silicon wafer substrates. To complement…
Through hardening bearing steels with low alloy content are sometimes surface hardened by induction hardening to implement compressive residual stresses into the surface. This method is not regularly applied for steels with high alloy content especially not for applications in the aerospace and space industry. Here ca…
An analytical method for the determination of uranium enrichment in uranium oxide without using any calibration standards is described. Very good agreement between the measured and certified values was obtained in the analysis of a Standard Reference Material. Precise energies and emission probabilities were derived f…
A seminal model describing the kinetics of growth of thin oxide films on metal crystals was proposed by Cabrera and Mott (CM). The model is based on the assumption that the growth is limited by the field-facilitated activated jumps of metal ions located in steps on the metal–oxide interface. We generalize the CM model…